rare classic BOSS Octave OC-2 pedal made in Japan by Roland corporation during middle '80s (black bottom label). It produces tones one or two octaves below the original note or both and has separate OCT1 and OCT2 controls as well as direct level control for exact tonal shaping. I bought it as new in that period and I am the sole owner, but I never used it too much because I like other kind of sound. Full functional, it only lack the "oct1" control cover (see pics).